A nurse is preparing to administer medication to a client who has gout. The nurse discovers that an error was made during the previous shift and the client received atenolol instead of allopurinol. Which of the following actions should the nurse take first?

The correct answer is A: Obtain the client's blood pressure. The nurse's first priority is to assess the client's current condition and potential adverse effects of atenolol. Atenolol is a beta-blocker that can lower blood pressure and heart rate. Obtaining the client's blood pressure will help determine if any immediate interventions are needed. Contacting the provider (B) can be done after assessing the client's condition. Informing the charge nurse (C) is important but not the first priority. Completing an incident report (D) is necessary but should follow immediate client assessment. Other choices are not relevant to the immediate safety and well-being of the client.